Dust oolleotob



(No Modl.) I 4 Sheets-Sheet 1. N. W. HOLT.-

DUST COLLECTOR."

No, 273,533. Patented Mar. 6,1883.

WITNESSES.-

(No Model.) 4 Sheets-Sheet 2.

N. W. HOLT.

DUST GOLLBGTOR.

No. 273,533. 9 Q Pat entd Mar. 6, 1883.

N. PEIERS. Moum n mr. Mu tan. D4 6.

a (No Model.) 4 Sheets-Sheet 3.

N. W; HOLT.

DUST COLLECTOR.

No. 273.533, Fly 3 Patented Mar.6, 1883.

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(No Model.) 4 Sheets-Sheet. 4.

N. W. HOLT.

DUST COLLECTOR. o. 273.533. Patented Mar.6,1883,.

37%; I JWA1WW- WW%+V/% NITED STATES PATENT OFFICE.

NOAH W. HOLT, OF BUFFALO, NEW YORK, ASSIGNOR, BY MESNE ASSIGN- MENTS, TOTHE GEORGE T. SMITH MIDDLINGS PURIFIER COMPANY, OF

J AOKSON MICHIGAN.

DUST-COLLECTO R.

SPECIFICATION forming part of Letters Patent N 0. 273,533, dated March6, 1883.

Application filed July 19, 1882. (No model) To all whom it may concernBe it known that I, NOAH W. HOLT, a citizen of the United States,residing at Buffalo, in the county of Erie and State of New York,

5 have invented certain new and useful Improvements in Dust-Collectors,of which the following is a specification, reference being bad thereinto the accompanying drawings.

Figure l is a horizontal section of a collecting mechanism embodying myimprovements. Fig. 2 is an end View of the reel, showing the casing insection. Fig. 3 is a horizontal sec tion of a machine similar to that inFigs. 1 and 2, except that two air-trunks are employed,

1 one at each end of the reel, both communicating with the interiorthereof. Fig. 4 is a central longitudinal vertical section of Fig. 3.Fig. 5 is a transverse section through the lower part of the reel. Fig.6 is a transverse section of a modified form of the collectingmechanism.

In the drawings the dust-collecting reel is represented generally by B.It has a filt 'ringcloth attached thereto, the cloth consisting eitherof a continuous sheet or of a suificient 2 5 nnmberof pieces arrangedcontin uousl y to form a filtering-surface around the reel.

A represents a chamber communicating with a middlings-purifier or otherdust-producing mechanism through one or more conduits, a.

50 The dust-laden air-current is caused to pass through thefiltering-cloth, the cloth operating to arrest and catch the dust, Whilethe air passes through freed therefrom.

The reel is constructed with beads B B and with two concentric series ofcloth-supportin g bars or ribs, B B The cloth is arranged upon thesesupports in zigzag planes, running toward and from the center. One orboth of the reel heads are provided with apertures, by

0 means of which the air, after passing'through the cloth, can beallowed to escape.

Within the reel there is arranged a stationary cut-otfif consistingpreferably of a curved diaphragm or plate arranged to be in close 5proximity to the inner series of cloth-supports, B It is supported uponthe stationary parts of the machine, as shown at u, there being a bar,'lt, for carrying it, together with downwardly-inclined arms 9 g. y

The cut-ofi' f interrupts the passage of the dust-laden air throughthose'portion's of the cloth which are adjacent to it, and thusfacilitates the dislodging of the dust. It will be seen that thosesections of the cloth lettered B are'those thus cut off from the aircurrent. By suspending the cut-off from the stationary parts of themachine all of the wear ordinarily incident to the supporting devicescommonly used in those machines employing a through rotary shaft isobviated. Hence after the cutofl' is once adjusted relatively to theinner cloth-supporting bars, B no further adjustment will be needed.

It will be seen that the reel is not supported by a centralthrough-shalt in the way generally followed, Such shaft necessitates theuse of arms,which would interfere with the stationary cut-off, and hencethis means of supporting the reel could not be advantageously used withthe cut-off 'mounted entirely independentl y of the reel and insidethereof. Therefore I mount the reel in such manner that the headsthereof constitute the bearings for the whole reel, and combinetherewith devices inside-0t the casing for engaging with the reel andimparting motion thereto. The heads, as shown,

rest upon tubular bearings 11, and preferably I attach hollow trunnionsf f to the heads around the apertures, said. trunnions being made ofmetal and giving a stronger hearing. The reel-bearings v are alsoutilized to support the cut-off inside of the reel, the bar at restingupon them. They may be supported directly in the walls of the chamber,or upon supplemental outside supports in any suitable way, as indicatedat a. The dust which is dislodged from the cloth drops into a receptacleor hopper,which has a tight bottom, upon which the dust is caught afterit has been dislodged. From this receptacle or hopper the dust isWithdrawn by a positively-acting mechanism, consisting preferably of aworm-conveyer, i, which carries it to an orifice, i.

' By having an air-aperture ateach end of the reel and each end of thecasing I can distribute the dust-laden air-current much more evenly overthe reel from one end to the other than if one aperture be used,in-which case the air tends to pass throughthe cloth at one end morethan at the other. In the larger machine it is a matter of greatadvantage to thus take a the air out at both ends of the reel.

rotate the reel, there would be more or less lack of tightnessin saidcasing to interfere with the proper distribution of the air. I transmitthe power to the reel from the conveyer shaft by means of interveningmechanism, which engages with the head or heads, said means to consistof belts z, or chains or other suitable devices, there beingone or morewheels, 2, on the conveyer-shaft adapted to transmit power through themto the reel head or heads.

Preferably packing-strips t, of rubber, leather, or other suitablematerial, are arranged between the heads of the reel and the walls ofthe surrounding casing, so as to entirely prevent the outward passage ofany unpuritied air, even though the volume of air delivered from theorifice to the dust-collector be greater than the suction-fan of thecollector can draw through the filter-cloth under some exigencies. Thedust that is collected upon the cloth is dislodged by means of aknoclter or hammer, S, arranged to impart blows to the cloth-support,the force ol'the blows being determined or regulated by the strength ofa spring, 8, having one end secured to the hammer or knocker and theother to t be stationary part of the machine. The knocker is mountedupon a pivot whit-h is stationary relatively to the reel, and itvibrates about said pivot to impart blows to the section of thecloth-supports successively.

I am aware that various means have been emplo ed for dislodging the dustfrom the filtering-suri'acein dust-collectors, such as knockers,brushes, and devices for jarring the cloth in various ways. It has alsobeen customary to reverse the direction of the blast through portions ofthe cloth successively for this purpose, and various mechanisms havebeen employed for shaking the cloth by alternately slackening andtightening it, and I am aware of the fact that use has been made ofrolling balls in reels whose collecting-surfaces have been arranged astrue cylinders; but I believe myself to be the first to have mounted amoving collecting-cloth upon supporting framepieces adapted to be struckatpoints between the ends of the reel, anti to have combined therewith aknockerorhammer which is mounted upon a support independent ot theclothframe, and arranged to strike said frame with comparatively severeblows. r

The inside cut-off operates in the manne above set forth to interruptthe passage of the dust-laden sections of the collecting-clothalternately; but as there is, under some circumstances, a tendency forthe dust-laden air to pass between the dust receptacle or hopper and thebottom of the reel, I combine with the parts above described an abutmentor Wall.0t1tside of the reel and arranged in closeproximitytothecollecting-cloth. As sho'wn,theabutment consists of upwardextensions, S S, of the dust hopper or receptacle, and in order to havethem more effectually perform their office I prefer to extend themlaterally concentrically with the reel and the inside cut-ofi',f Thisouter abutment, so far as preventing the air from passing through anysection or sections of the collecting-cloth is concerned, is merelyadditional to or cumulative relative to the inside cut-oif,f but toprovide a safeguard against the aforesaid passing of air below thebottom of the reel, I prefer to use them both.

In Fig. 6 I have shown a form of collectingreels by which many of theobjects at which I aim can be attained, but in which the outsideabutment is dispensed with. The inside cut-oif f operates substantiallyin the same manner as in the construction above described, as do alsothe air-exits, the trunk, the devices for driving the reel, the knocker,8:0.

I am aware that use has been made ofa rotating reel, cylindricallyarranged, to collect material from a current of air and deposit saidmaterial in conduits, which carry them back to the chamber through whichthe laden current of air is brought to the reel, said devices beingshown, for instance, in the patent to Burdick and Fuller, No. 149,434,April 7, 1874, and I do not claim the devices which have been thus used.

ln mechanism of the kind above disclaimed the part which has been usedto stop the aircurrent has been suspended from a rotating shaft in amanner which I desire to avoid.

I do not herein claim any of the features other than those specificallyset forth in the claim, reserving to myself, however, the right to claimthe other generic and specific patentable matter which I have shown inanother application which I have tiled, Serial No.1,428, tile-l January26, 1880, of which this is a division.

I do not limit myself to all the parts in detail which I have shown, asit is apparent that some of the novel features illustrated and describedmay be separated from the others and combined with other devices withoutdeparting from the spirit of my invention so far as it relates to the prtions that are separable. Thus it will be seen that the knot-king orhammering devicesfordislodgingthedustwilloperate more advantageouslythan the devices used heretofore, whether or not they be combined withthesespecitic lormsofdevices forcutting ofl'the air which I have shown,or combined with this specific form of cloth-support. So, also, theadvantages incident to supporting the inside cut-off stationarllyrelatively to the revolving parts are attained irrespective ofemployment therewith of the outside abutment.

IIO

The means for evenly distributing the air 7 and radial arms have beenmounted in many I ing, a filtering-reel, mechanism acting upon ways nowwell known by constructing them with beads adapted to rest and rotatedirectly upon the bearings of the reel, I wish it understood that I donot limit myself to the specific form of reel-mounting of this classwhich I have shown, for, when combined with an airtight casing and theother devices set forth, a mountingofa modified form could be employedto similar advantage. I

One feature which distinguishes my invention from those which havepreceded it is the method of supporting the reel-heads, which havecentral openings, directly upon the stationary bearings, instead of uponacentral reelshaft which rotates with the reel, and wherever in thiscase I refer to a reel having heads at its ends resting upon bearings Imean reelheads which engage directly with the reel-supports and rotaterelatively thereto.

I have shown in the drawings the machine constructed with one of itstubular bearings communicating with the fan, also another organizationin which both the hollow trunnions are connected with the fan-case. Itherefore desire to be understood that in claiming the hollow trunnionsI wish to cover as well the structure shown where both trunnions arehollow as the one where only one of the trunnions following elements,namely: an inclosiug-cas' ing, a filtering-reel having a zigzag surlaceinclosed within the casin g, and a cut-off arranged within the reel andbelow the center of the reel, asuction-fan, and air-trunk connecting thefan with openings in the reel-heads, substantiallyas set forth.

3. In a dust-collector, the combination of the 0 following elements,namely: an inclosing-casthe reel-heads within the casing to rotate thereel,a cut-off for isolating portions of the filtering-surfacesalternately, and a jarrin g mechanism for dislodgin g the dust from theisolated portion of the filtering-reel, substantiallyas set forth.

4. In a dust-collector, the combination of the following elements,namely: an inclosing-casin g, a rotating filtering-reel having zigzagsurfaces, mechanism acting upon the reel-heads within the casing torotate the reel, a cut-off arranged inside of said reel for isolatingportions of the filtering-surfaces alternately, and a jarring mechanismfor removing the-dust from the isolated portion of the filtering-reel,substantially as set forth.

5. In a dust-collector, the combination of the following elements,namely: an inclosing-casing, a rotary reel inside of thecasing, thetubular bearings for the ends of the reel, whereby it may be mountedwithout a through-shaft, and a cut-off inside and supportedindependently of the reel, substantially as set forth 6. In adust-collector, the combination of the following elements, namely: aninclosing-casing, a rotating filtering-reel in said casin g, hollowtrunnions for mounting said reel, communicating with the interior of thereel, and a suction-fan adapted to draw air from the easing into theinterior of the reel through the filtering material and out of saidreel, substantially as set forth.

7. In a dust-collector, the combination of an inclosing-casing, azigzagged shaftless rotating reel, a tan moving air into the reelthrough the cloth and outward axially, a fixed cut-oii' placed on theinside of the reel, so as to intercept the inflow of air through a partof the zigzagged sections, and a trough placed under the isolatedsections to receive the dust dislodged from such sections, substantiallyas set forth.

In testimony whereof I affix my signature in Witnesses A. 'B. KELLOGG,RIoHD. K. N om.

